...— as, army of invasion, army of occupation, army of observation, army of reserve, &c.; or from the country or direction in which they operate — as, army of the North, of the South, of Mexico , of Canada, of the Rhine, &c.; or from the general who commands it — as, the army of Soult, army of Wellington, army of Blucher, &c.
All modern armies are organized on the same basi...